Blow-cut boot



Patented May 7, 1929.

Urrsn STATES WALTER GILBERT, OF ST. LOUIS, MISSOURI.

- BLOW-OUT BOOT.

Application filed December This invention relates to blow-out boots which are adapted to strengthen and reinforce tire casings which have become weal:- ened or perforated.

When a boot is placed in. a tire it is subjccted to forces tending to continually shift the same, and the frictionwill cause wear, not only of the inside wall of the casing but also of the outside wall of the boot. This wear is always present where the outer surface of the boot is of fabric, and is present even if only a part of this outer surface is of fabric. Any friction between even a part of the casing and boot will soon cause the casing wall to become weakened sufficiently to give under the internal pressure; but even if the casing; does not give, there will be opened an entrance for water and sand, resulting in the destruction of the inner tube.

@ne of the objects of this invention, there fore, is to provide a blow-out boot in which the outer surface is so formed as to avoid friction between the boot and the casing.

lr urther objects will appear from the detail description taken in connection with the accompanying drawing, in which:

Figure l is a section along an automobile tire showing a blow-out boot embodying this invention; and

Figure 2 is a perspective view.

In accordance with an embodiment of this invention, as shown in the drawing, the blow-out boot comprises an oblong: fabric body 1, preferably of several layers, impregnated, cemented or otherwise secured together in. a manner usual in the construction of blow-out boots, and the body may thin or chainfer to the edges usual. The outside of the body 1 has, however, applied thereto a sheet 2 of rubber and this is secured in any suitable manner as by cement. The sheet 2 is, however, of a live rubber and I have found that inner tube rubber is especially suitable for attaining the desired re sults; other rubber having the character of inner tube rubber is, however, suitable. In order to attain the desired results, the sheet 2 should cover the fabric body 1 throughout its area so that the fabric will not touch the casing when the boot inv place. It is further advantageous that the rubber extend beyond the fabric body at the ends as shown at 3 so as to prevent the inner tube from ch aiing at the ends of the boot; it is also advantageous that the rubber extend beyond the 1, 1924. Serial noprsaeeo.

fabric body at the sides as shown at a. The

boot canbe made in all sizes and either oblong or square; it is also preferably shaped as shown.

In order to apply the boot to a casing 5, a coat of any rubber cement can be applied to the outside surface of the rubber sheet 2; that is not, however, necessary when the inner surface of the casing is cleansed with gasoline; in both cases the rubber-sheet will adhere firmly to the casing when the inner tube 6 is inflated and the boot pressed against the casing; in fact the rubber sheet will become cemented and practically vulcanized to the casing.

The invention accomplishes its objects in a simple and effective manner. The boot will adhere to the casing so that shifting is prevented. and friction avoided; for by making the outside sheet 3 of inner tube rul ber continuousso as to provide a continuous outer face this sheet will lie evenly against and adhere to the casing. In view of the fact that the rubber sheet completely and entirely covers the fabric body, the fabric is maintained wholly out of frictional contact with the casing throughout its area so that no wear can take place at any point between the boot and the casing. It will be particularly noted. that the rubber sheet is not onl of substantial and uniform thickness throughout its extent and throiurhout its engaging surface with the fabric, but particulzirly so at the cd es and at the ends so as to maintain the fabric out of frictional contact with the ens-sing throughout the length of the fabric boot from end to end. By attaching to the outside of the fabric body a sheet of in nor tube rubber as distinguished from soft vulcanized rubber, and by extending this sheet so as to not only completely cover the fabric body but project therebeyond, especially at its ends, a layer of substantially procured and tough rubber of substantial thickness is provided to not only maintain the fabric out of frictional contact with the casing; throughout the length of the fabric body, but also alongr the lines between the ends of the fabric and the casing. Accordingly when the body is in use the fabric cannot wear through the outside covering and. come into frictional contact with the casing as would be the case if this rubber were simply of soft uncured rubber even if vulcanized. The body is adapted for use not only in high pressure cord tires but also in low pressure-balloon tires; furthermore it can be used not only as an emergency reinforcement, but also as a permanent one and even in vulcanizing.

It will be particularly noted that the boot,

including its fabric body and the sheet of rubber, is oblong in forin and that the attached rubber sheet covers the entire'outer surface including the'side and end edges of the fabricbody. This construction not only enables a given boot to be used for two sizes of casings by being placed with its long dimension either along the casing, or with its small dimension along a large casing, but when used ineither relation the fabric is maintained wholly out of frictional contact with the casing throughout its area.

i It is obvious that various changes may be made in details without departing from the spirit of this invention; it is, therefore, to

be understood that this invention is not to be limited to the specific details shown and described.

Having thus described the invention, What is claimed is: v

1. A blow-out boot adapted for placement between the casing and tube of a tire comprising, a flexible fabric body having a continuous outside sheet of inner tube rubber united therewith and extending therebeyond at its ends and edges in order to lie evenly against and adhere to the casing, said sheet providing a precured and tough rubber wall of substantial thickness between the casing and the fabric body in order to maintain them out of frictional contact.

' 2. A blow-out boot adapted for placement between'the casing and tube of a tire, comprising, an oblong fabric body having a continuous oblong sheet of inner tube rubber attached thereto and projecting beyond its side and end edges in order to lie evenly against and adhere to the casing, said sheet providing a precured and tough rubber wall of substantial thickness between the casing and fabric body so as to maintain the body out of frictional contact with the casing throughout its area.

3. A blow-out boot adapted for placement between the casing and tube of a tire, comprising, a fabric body having a continuous sheet of inner tube rubber outside thereof and extending therebcyond at its ends and sides in order to lie evenly against and adhere to the casing, said sheet providing a precured and tough rubber wall of substantial thickness between the casing and fabric body so as to maintain the body out of trietional contact with the casing throughout its area.

In testimony whereof I afiix my signature this 5th day of November, 1924.

WALTER GILBERT. 

